趙惠文(wen)王六(liu)年(nian)(前293年(nian)),封公子趙勝為平原君。平原君喜(xi)好名家論辨之(zhi)言,公孫龍遂為平原君的門(men)客。
趙惠文王(wang)十五年(前284年),燕昭王(wang)欲攻(gong)齊(qi)國(guo),公孫(sun)龍帶領弟子,從趙國(guo)趕到(dao)燕國(guo),力(li)圖勸其“偃兵”。燕王(wang)滿口(kou)答應,公孫(sun)龍卻表(biao)示不(bu)可相信,說道:當初大王(wang)招納欲破(po)(po)齊(qi)、能(neng)破(po)(po)齊(qi)的(de)(de)“天下(xia)之(zhi)士”到(dao)燕國(guo)來,后來終于破(po)(po)齊(qi)。而(er)今“諸侯(hou)之(zhi)士在大王(wang)之(zhi)本朝者,盡(jin)善用(yong)兵者”,所以(yi)我認為大王(wang)不(bu)會偃兵。他用(yong)這種(zhong)“循實則名(ming)”的(de)(de)方法(fa)猜透了燕王(wang)的(de)(de)真實用(yong)心(xin),使燕王(wang)無(wu)言以(yi)對。
十六年(前283年),秦(qin)國(guo)與(yu)趙(zhao)國(guo)盟會(hui)締約(yue):“秦(qin)之(zhi)所欲(yu)為,趙(zhao)助之(zhi);趙(zhao)之(zhi)所欲(yu)為,秦(qin)助之(zhi)。”答(da)應相互援(yuan)助。不(bu)久,秦(qin)興兵(bing)攻魏(wei)(wei),趙(zhao)欲(yu)救魏(wei)(wei)。秦(qin)王(wang)使人責備趙(zhao)惠文(wen)王(wang)不(bu)遵守盟約(yue)。趙(zhao)王(wang)將此事告知(zhi)平原君。公孫龍向(xiang)平原君建議說:趙(zhao)也可以派遣使者去責備秦(qin)王(wang)說,趙(zhao)國(guo)想援(yuan)救魏(wei)(wei)國(guo),秦(qin)國(guo)卻攻打(da)魏(wei)(wei)國(guo),是秦(qin)國(guo)首(shou)先違(wei)背了(le)盟約(yue)。
十九年(nian)(前280年(nian)),公(gong)孫(sun)龍(long)又與趙惠文(wen)王論偃(yan)(yan)兵(bing)之(zhi)(zhi)事(shi)。趙王問公(gong)孫(sun)龍(long)說:“寡(gua)人事(shi)偃(yan)(yan)兵(bing)十余年(nian)矣,而(er)不成,兵(bing)不可偃(yan)(yan)乎?”公(gong)孫(sun)龍(long)回答說:“偃(yan)(yan)兵(bing)之(zhi)(zhi)意,兼愛(ai)天(tian)下之(zhi)(zhi)心也。兼愛(ai)天(tian)下,不可以虛(xu)名(ming)為(wei)也,必有其(qi)實。”并指出趙惠文(wen)王當秦得地而(er)縞素(su)布總,齊亡地而(er)加膳置酒,并不真正具有兼愛(ai)之(zhi)(zhi)心,故不能行偃(yan)(yan)兵(bing)之(zhi)(zhi)實。
趙(zhao)孝成王九年(前257年),秦兵攻(gong)趙(zhao),圍邯鄲。平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun)使人向(xiang)魏國(guo)求(qiu)救(jiu)。信陵君(jun)(jun)(jun)(jun)(jun)率(lv)兵救(jiu)趙(zhao),邯鄲得以保(bao)存。虞卿為(wei)平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun)向(xiang)趙(zhao)王請封。公孫龍連夜駕車入見(jian)平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun),認為(wei)此舉甚不(bu)(bu)可行,指(zhi)出“王舉君(jun)(jun)(jun)(jun)(jun)而相(xiang)趙(zhao),割東(dong)武城(cheng)而封君(jun)(jun)(jun)(jun)(jun)者”并不(bu)(bu)是(shi)(shi)(shi)因(yin)為(wei)平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun)的(de)(de)(de)才智能力為(wei)趙(zhao)國(guo)所獨(du)有的(de)(de)(de),而是(shi)(shi)(shi)因(yin)為(wei)平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun)是(shi)(shi)(shi)趙(zhao)王親(qin)戚(qi)的(de)(de)(de)緣故(gu)。而“一解國(guo)患,欲求(qiu)益地,是(shi)(shi)(shi)親(qin)戚(qi)受(shou)封而國(guo)人計(ji)功也”,即計(ji)國(guo)人之功于親(qin)戚(qi)名下(xia)。因(yin)此建議(yi)平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun)不(bu)(bu)要受(shou)封,平(ping)原(yuan)君(jun)(jun)(jun)(jun)(jun)聽從了公孫龍的(de)(de)(de)建議(yi),并由此對(dui)其益加看重。
他可能(neng)(neng)較長時間作平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)的(de)門客。《史記·平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)虞(yu)卿列傳》說(shuo)(shuo),“平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)厚待公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)”。約(yue)于公(gong)(gong)(gong)(gong)(gong)元前279年(nian)(nian)至前248年(nian)(nian)間,公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)曾(ceng)從趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)帶領弟子(zi)到(dao)燕(yan)國(guo)(guo)(guo)(guo)(guo),《呂氏春秋(qiu)·應(ying)言》載,是(shi)為(wei)了(le)說(shuo)(shuo)燕(yan)昭(zhao)王(wang)(wang)以(yi)(yi)(yi)(yi)“偃(yan)兵(bing)(bing)(bing)”。燕(yan)王(wang)(wang)雖然表示同意(yi)(yi)(yi),公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)卻當面對燕(yan)王(wang)(wang)說(shuo)(shuo)。“諸侯(hou)之(zhi)士在(zai)(zai)大王(wang)(wang)之(zhi)本朝(chao)者(zhe),盡(jin)善用兵(bing)(bing)(bing)者(zhe)”,所(suo)(suo)(suo)以(yi)(yi)(yi)(yi)我認為(wei)大王(wang)(wang)不(bu)會偃(yan)兵(bing)(bing)(bing),燕(yan)昭(zhao)王(wang)(wang)無(wu)(wu)言應(ying)答。公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)又曾(ceng)游(you)魏(wei),與(yu)(yu)公(gong)(gong)(gong)(gong)(gong)子(zi)牟論(lun)(lun)學。在(zai)(zai)趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo),《呂氏春秋(qiu)·審應(ying)覽》載,公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)曾(ceng)與(yu)(yu)趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)惠文王(wang)(wang)論(lun)(lun)偃(yan)兵(bing)(bing)(bing)。趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)王(wang)(wang)問公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)說(shuo)(shuo):“寡人(ren)事偃(yan)兵(bing)(bing)(bing)十余年(nian)(nian)矣,而不(bu)成(cheng)(cheng),兵(bing)(bing)(bing)不(bu)可偃(yan)乎(hu)?”公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)回答說(shuo)(shuo):“趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)的(de)藺、離石兩地(di)被秦(qin)(qin)侵占(zhan),王(wang)(wang)就(jiu)穿(chuan)上(shang)喪國(guo)(guo)(guo)(guo)(guo)的(de)服裝,縞(gao)素布總;東(dong)攻(gong)齊得(de)城,而王(wang)(wang)加膳置(zhi)酒(jiu),以(yi)(yi)(yi)(yi)示慶祝。這怎能(neng)(neng)會偃(yan)兵(bing)(bing)(bing)?”《呂氏春秋(qiu)·淫辭(ci)》說(shuo)(shuo):秦(qin)(qin)國(guo)(guo)(guo)(guo)(guo)跟趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)訂立盟(meng)(meng)約(yue):“秦(qin)(qin)之(zhi)所(suo)(suo)(suo)欲為(wei),趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)助(zhu)之(zhi);趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)之(zhi)所(suo)(suo)(suo)欲為(wei),秦(qin)(qin)助(zhu)之(zhi)。”過了(le)不(bu)久。秦(qin)(qin)興兵(bing)(bing)(bing)攻(gong)魏(wei),趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)欲救(jiu)(jiu)魏(wei)。秦(qin)(qin)王(wang)(wang)使(shi)人(ren)責備(bei)趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)惠文王(wang)(wang)不(bu)遵守盟(meng)(meng)約(yue)。趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)王(wang)(wang)將(jiang)這件事告訴平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)。公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)給平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)出主意(yi)(yi)(yi)說(shuo)(shuo),趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)可以(yi)(yi)(yi)(yi)派遣(qian)使(shi)者(zhe)去責備(bei)秦(qin)(qin)王(wang)(wang)說(shuo)(shuo),秦(qin)(qin)不(bu)幫(bang)助(zhu)趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)救(jiu)(jiu)魏(wei),也是(shi)違(wei)背盟(meng)(meng)約(yue)。趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)孝成(cheng)(cheng)王(wang)(wang)九年(nian)(nian)(公(gong)(gong)(gong)(gong)(gong)元前257年(nian)(nian)),秦(qin)(qin)兵(bing)(bing)(bing)攻(gong)趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao),平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)使(shi)人(ren)向(xiang)魏(wei)國(guo)(guo)(guo)(guo)(guo)求救(jiu)(jiu)。信陵(ling)君(jun)率兵(bing)(bing)(bing)救(jiu)(jiu)趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao),邯鄲得(de)以(yi)(yi)(yi)(yi)保存。趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)的(de)虞(yu)卿欲以(yi)(yi)(yi)(yi)信陵(ling)君(jun)之(zhi)存邯鄲為(wei)平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)請(qing)求增(zeng)加封地(di)。公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)聽說(shuo)(shuo)這件事,勸阻平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)說(shuo)(shuo):“君(jun)無(wu)(wu)覆軍(jun)殺將(jiang)之(zhi)功,而封以(yi)(yi)(yi)(yi)東(dong)武城。趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)豪杰(jie)之(zhi)士,多在(zai)(zai)君(jun)之(zhi)右,而君(jun)為(wei)相(xiang)國(guo)(guo)(guo)(guo)(guo)者(zhe)以(yi)(yi)(yi)(yi)親(qin)故(gu)。夫君(jun)封以(yi)(yi)(yi)(yi)東(dong)武城,不(bu)讓無(wu)(wu)功,佩趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao)國(guo)(guo)(guo)(guo)(guo)相(xiang)印,不(bu)辭(ci)無(wu)(wu)能(neng)(neng),一(yi)解國(guo)(guo)(guo)(guo)(guo)患(huan),欲求益地(di),是(shi)親(qin)戚受(shou)(shou)封,而國(guo)(guo)(guo)(guo)(guo)人(ren)計(ji)功也。為(wei)君(jun)計(ji)者(zhe),不(bu)如勿受(shou)(shou)便。”平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)接(jie)受(shou)(shou)了(le)公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)的(de)意(yi)(yi)(yi)見,沒有接(jie)受(shou)(shou)封地(di)。公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)善于辯(bian)論(lun)(lun)。《公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)子(zi)·跡府》說(shuo)(shuo),公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)與(yu)(yu)孔穿(chuan)在(zai)(zai)平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)家相(xiang)會,談辯(bian)公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)的(de)“白馬(ma)(ma)非(fei)(fei)馬(ma)(ma)”。晚年(nian)(nian),齊使(shi)鄒(zou)衍過趙(zhao)(zhao)(zhao)(zhao)(zhao)(zhao),平(ping)(ping)(ping)(ping)(ping)(ping)原(yuan)(yuan)君(jun)使(shi)與(yu)(yu)公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)論(lun)(lun)“白馬(ma)(ma)非(fei)(fei)馬(ma)(ma)”之(zhi)說(shuo)(shuo)。公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)由(you)是(shi)遂詘,后不(bu)知所(suo)(suo)(suo)終。公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)的(de)主要思(si)想,保存在(zai)(zai)《公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)子(zi)》一(yi)書(shu)(shu)中。《漢(han)書(shu)(shu)·藝文志》名家有《公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)子(zi)》十四篇。今存六篇。《跡府》,是(shi)后人(ren)匯集公(gong)(gong)(gong)(gong)(gong)孫(sun)(sun)(sun)(sun)(sun)龍(long)(long)(long)(long)的(de)生平(ping)(ping)(ping)(ping)(ping)(ping)言行寫成(cheng)(cheng)的(de)傳略(lve)。其(qi)余五(wu)篇是(shi):《白馬(ma)(ma)論(lun)(lun)》、《指(zhi)物(wu)論(lun)(lun)》、《通變(bian)論(lun)(lun)》、《堅白論(lun)(lun)》、《名實論(lun)(lun)》,其(qi)中以(yi)(yi)(yi)(yi)《白馬(ma)(ma)論(lun)(lun)》最著名。
公(gong)孫(sun)龍的哲學思想,《淮南子(zi)》說,公(gong)孫(sun)龍"別同異,離堅白"。
他與惠施的(de)(de)"合同(tong)異"說(shuo)正相(xiang)反,完全脫離感(gan)性認識(shi),只強調(diao)概念的(de)(de)邏(luo)輯分析,具有十(shi)分濃厚的(de)(de)形而上學(xue)特色。但在(zai)邏(luo)輯學(xue)上,他的(de)(de)貢獻是值(zhi)得重視的(de)(de)。
公孫龍(long)(long)的(de)(de)(de)(de)"離(li)(li)(li)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)"學(xue)說(shuo)是(shi)(shi)(shi)從對"堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)石"的(de)(de)(de)(de)分析出發的(de)(de)(de)(de)。《公孫龍(long)(long)子·堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)論》說(shuo):"視不(bu)得其(qi)(qi)(qi)所(suo)(suo)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)而(er)(er)(er)得其(qi)(qi)(qi)所(suo)(suo)白(bai)(bai)(bai)(bai)者(zhe),無(wu)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)也;拊不(bu)得其(qi)(qi)(qi)所(suo)(suo)白(bai)(bai)(bai)(bai)而(er)(er)(er)得其(qi)(qi)(qi)所(suo)(suo)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)者(zhe),無(wu)白(bai)(bai)(bai)(bai)也。"即(ji)人們(men)用眼(yan)睛看(kan),不(bu)知(zhi)道它(ta)(ta)是(shi)(shi)(shi)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)的(de)(de)(de)(de),而(er)(er)(er)知(zhi)道石是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)顏色(se)(se)(se)的(de)(de)(de)(de),這(zhe)(zhe)(zhe)(zhe)就(jiu)是(shi)(shi)(shi)沒有(you)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying);用手(shou)摸不(bu)知(zhi)道它(ta)(ta)是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)顏色(se)(se)(se),而(er)(er)(er)知(zhi)道它(ta)(ta)是(shi)(shi)(shi)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)的(de)(de)(de)(de),這(zhe)(zhe)(zhe)(zhe)就(jiu)是(shi)(shi)(shi)沒有(you)白(bai)(bai)(bai)(bai)顏色(se)(se)(se)。在前一(yi)種(zhong)情況下,堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)藏(zang)(zang)了起(qi)(qi)來。在后一(yi)種(zhong)情況下,白(bai)(bai)(bai)(bai)色(se)(se)(se)藏(zang)(zang)了起(qi)(qi)來。這(zhe)(zhe)(zhe)(zhe)叫作"自(zi)藏(zang)(zang)"。《堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)論》又說(shuo):"得其(qi)(qi)(qi)白(bai)(bai)(bai)(bai),得其(qi)(qi)(qi)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian),見與不(bu)見離(li)(li)(li)。不(bu)見離(li)(li)(li)一(yi)。一(yi)不(bu)相(xiang)盈,故(gu)離(li)(li)(li)離(li)(li)(li)也者(zhe),藏(zang)(zang)也。"看(kan)到它(ta)(ta)的(de)(de)(de)(de)白(bai)(bai)(bai)(bai)顏色(se)(se)(se),摸到它(ta)(ta)的(de)(de)(de)(de)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying),有(you)"見與不(bu)見"的(de)(de)(de)(de)情況,這(zhe)(zhe)(zhe)(zhe)就(jiu)叫離(li)(li)(li),因為(wei)石與堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)、白(bai)(bai)(bai)(bai)不(bu)能互相(xiang)包含,所(suo)(suo)以就(jiu)分離(li)(li)(li)了。分離(li)(li)(li)了也就(jiu)是(shi)(shi)(shi)藏(zang)(zang)起(qi)(qi)來了。他(ta)認(ren)為(wei),"天下未(wei)有(you)若(ruo)(ruo)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian),而(er)(er)(er)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)藏(zang)(zang)"。又說(shuo):"若(ruo)(ruo)白(bai)(bai)(bai)(bai)者(zhe)必白(bai)(bai)(bai)(bai),則不(bu)白(bai)(bai)(bai)(bai)石物(wu)而(er)(er)(er)白(bai)(bai)(bai)(bai)焉。""石其(qi)(qi)(qi)無(wu)有(you),惡取堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)乎?故(gu)離(li)(li)(li)也。"這(zhe)(zhe)(zhe)(zhe)是(shi)(shi)(shi)說(shuo),不(bu)使石與物(wu)變堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)而(er)(er)(er)獨(du)立的(de)(de)(de)(de)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)(即(ji)抽象的(de)(de)(de)(de)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)),天下是(shi)(shi)(shi)沒有(you)的(de)(de)(de)(de)。這(zhe)(zhe)(zhe)(zhe)就(jiu)是(shi)(shi)(shi)說(shuo),堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)藏(zang)(zang)起(qi)(qi)來了。若(ruo)(ruo)白(bai)(bai)(bai)(bai)顏色(se)(se)(se)本身定是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)顏色(se)(se)(se)的(de)(de)(de)(de)話,它(ta)(ta)就(jiu)不(bu)必通過使物(wu)體發白(bai)(bai)(bai)(bai)而(er)(er)(er)表現自(zi)己(ji)是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)。他(ta)把(ba)本身是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)顏色(se)(se)(se)看(kan)成(cheng)(cheng)一(yi)種(zhong)抽象的(de)(de)(de)(de)白(bai)(bai)(bai)(bai)顏色(se)(se)(se)。它(ta)(ta)看(kan)不(bu)見,即(ji)是(shi)(shi)(shi)藏(zang)(zang)起(qi)(qi)來了。石頭(tou)假如沒有(you)獨(du)立成(cheng)(cheng)為(wei)石的(de)(de)(de)(de)本領,又怎(zen)么能夠形成(cheng)(cheng)既堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)又白(bai)(bai)(bai)(bai)的(de)(de)(de)(de)石呢(ni)?因此,他(ta)的(de)(de)(de)(de)結論是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)色(se)(se)(se)與堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)硬(ying)并不(bu)是(shi)(shi)(shi)結合在石頭(tou)里面,而(er)(er)(er)是(shi)(shi)(shi)脫離(li)(li)(li)石頭(tou)獨(du)立存在的(de)(de)(de)(de)。這(zhe)(zhe)(zhe)(zhe)就(jiu)是(shi)(shi)(shi)"離(li)(li)(li)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)"學(xue)說(shuo)的(de)(de)(de)(de)主要論點。這(zhe)(zhe)(zhe)(zhe)一(yi)學(xue)說(shuo)把(ba)事物(wu)的(de)(de)(de)(de)各種(zhong)屬性一(yi)方面與物(wu)質實體割裂開(kai),另一(yi)方面又把(ba)它(ta)(ta)們(men)一(yi)一(yi)孤立起(qi)(qi)來而(er)(er)(er)否認(ren)其(qi)(qi)(qi)統(tong)一(yi)性。這(zhe)(zhe)(zhe)(zhe)在哲(zhe)學(xue)上就(jiu)意味著一(yi)般不(bu)是(shi)(shi)(shi)存在個別之中(zhong),而(er)(er)(er)是(shi)(shi)(shi)可(ke)以脫離(li)(li)(li)個別單獨(du)存在的(de)(de)(de)(de)。公孫龍(long)(long)"離(li)(li)(li)堅(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)"學(xue)說(shuo)的(de)(de)(de)(de)詭辯性質,在他(ta)的(de)(de)(de)(de)"白(bai)(bai)(bai)(bai)馬(ma)非馬(ma)"的(de)(de)(de)(de)命(ming)題中(zhong)表現最為(wei)明(ming)顯。
"白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"是(shi)(shi)(shi)古代思想史上的(de)(de)(de)著名命(ming)題。公孫龍的(de)(de)(de)論證(zheng)(zheng)是(shi)(shi)(shi)這樣(yang)的(de)(de)(de):"馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)者(zhe)(zhe),所(suo)以(yi)命(ming)形也(ye)(ye);白(bai)(bai)(bai)(bai)(bai)(bai)者(zhe)(zhe)所(suo)以(yi)命(ming)色(se)(se)也(ye)(ye)。命(ming)色(se)(se)者(zhe)(zhe)非命(ming)形也(ye)(ye)。故曰:白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)。"①"馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"一(yi)(yi)(yi)詞是(shi)(shi)(shi)指(zhi)(zhi)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)的(de)(de)(de)形態(tai),凡是(shi)(shi)(shi)具有馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)的(de)(de)(de)形態(tai)的(de)(de)(de)都(dou)命(ming)名為馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)。"白(bai)(bai)(bai)(bai)(bai)(bai)"一(yi)(yi)(yi)詞是(shi)(shi)(shi)指(zhi)(zhi)白(bai)(bai)(bai)(bai)(bai)(bai)的(de)(de)(de)顏(yan)色(se)(se),凡是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)(bai)(bai)顏(yan)色(se)(se)的(de)(de)(de)都(dou)命(ming)名為白(bai)(bai)(bai)(bai)(bai)(bai)。"白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"是(shi)(shi)(shi)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)的(de)(de)(de)形態(tai)再加(jia)上白(bai)(bai)(bai)(bai)(bai)(bai)的(de)(de)(de)顏(yan)色(se)(se),亦即白(bai)(bai)(bai)(bai)(bai)(bai)顏(yan)色(se)(se)的(de)(de)(de)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)。可見,馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)與(yu)(yu)(yu)白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)是(shi)(shi)(shi)兩(liang)個不(bu)(bu)同的(de)(de)(de)概(gai)念(nian),所(suo)以(yi)他(ta)(ta)說(shuo)(shuo)(shuo):"白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"。這是(shi)(shi)(shi)從(cong)概(gai)念(nian)的(de)(de)(de)內涵(han)方面來論證(zheng)(zheng)的(de)(de)(de)。其次,他(ta)(ta)又(you)從(cong)"馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"與(yu)(yu)(yu)"白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"的(de)(de)(de)外(wai)(wai)延不(bu)(bu)同來論證(zheng)(zheng)。他(ta)(ta)說(shuo)(shuo)(shuo):"求馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma),黃(huang)、黑(hei)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)皆可致;求白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma),黃(huang)、黑(hei)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)不(bu)(bu)可致"。②馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)一(yi)(yi)(yi)詞的(de)(de)(de)外(wai)(wai)延包括一(yi)(yi)(yi)切馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)在內,所(suo)以(yi)黃(huang)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)、黑(hei)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)都(dou)在內。白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)的(de)(de)(de)外(wai)(wai)延僅(jin)限于白(bai)(bai)(bai)(bai)(bai)(bai)顏(yan)色(se)(se)的(de)(de)(de)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma),所(suo)以(yi)黃(huang)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)、黑(hei)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)不(bu)(bu)在內。馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)與(yu)(yu)(yu)白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)兩(liang)個概(gai)念(nian)既然有這樣(yang)的(de)(de)(de)差別(bie),所(suo)以(yi)他(ta)(ta)說(shuo)(shuo)(shuo):"白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)"。第三(san),他(ta)(ta)又(you)從(cong)個別(bie)(個性(xing))與(yu)(yu)(yu)一(yi)(yi)(yi)般(共性(xing))的(de)(de)(de)關系來論證(zheng)(zheng)。他(ta)(ta)說(shuo)(shuo)(shuo):"白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma),非馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)也(ye)(ye)。白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)者(zhe)(zhe),馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)與(yu)(yu)(yu)白(bai)(bai)(bai)(bai)(bai)(bai)也(ye)(ye),白(bai)(bai)(bai)(bai)(bai)(bai)與(yu)(yu)(yu)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)也(ye)(ye)。故曰:白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)也(ye)(ye)。"③這是(shi)(shi)(shi)說(shuo)(shuo)(shuo),白(bai)(bai)(bai)(bai)(bai)(bai)是(shi)(shi)(shi)一(yi)(yi)(yi)切白(bai)(bai)(bai)(bai)(bai)(bai)色(se)(se)的(de)(de)(de)共性(xing),而不(bu)(bu)是(shi)(shi)(shi)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma),馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)是(shi)(shi)(shi)一(yi)(yi)(yi)切馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)的(de)(de)(de)共性(xing),而不(bu)(bu)是(shi)(shi)(shi)白(bai)(bai)(bai)(bai)(bai)(bai)。白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)指(zhi)(zhi)白(bai)(bai)(bai)(bai)(bai)(bai)色(se)(se)的(de)(de)(de)共性(xing)加(jia)上馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)的(de)(de)(de)共性(xing)。所(suo)以(yi)白(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)并不(bu)(bu)是(shi)(shi)(shi)馬(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)(ma)。
公(gong)孫(sun)龍的(de)(de)(de)論(lun)證在邏輯(ji)上和(he)概(gai)(gai)念(nian)分(fen)析上做出(chu)了(le)獨到(dao)的(de)(de)(de)歷史(shi)貢(gong)獻,但(dan)是他把(ba)一(yi)(yi)些概(gai)(gai)念(nian)混(hun)淆(xiao)而流入詭辯(bian)。他分(fen)析了(le)馬與(yu)白馬這(zhe)(zhe)兩個(ge)概(gai)(gai)念(nian)的(de)(de)(de)差(cha)別(bie)(bie)(bie)、個(ge)別(bie)(bie)(bie)與(yu)一(yi)(yi)般(ban)的(de)(de)(de)差(cha)別(bie)(bie)(bie)。但(dan)是,他夸大了(le)這(zhe)(zhe)種差(cha)別(bie)(bie)(bie),把(ba)兩者完全割(ge)裂開(kai)來,并加以絕對化;最后達到(dao)否認(ren)個(ge)別(bie)(bie)(bie),只承認(ren)一(yi)(yi)般(ban),使一(yi)(yi)般(ban)脫(tuo)離個(ge)別(bie)(bie)(bie)獨立存在。這(zhe)(zhe)樣,就把(ba)抽象(xiang)的(de)(de)(de)概(gai)(gai)念(nian)當成脫(tuo)離具體事物的(de)(de)(de)精(jing)神實體,從而導致了(le)客觀唯(wei)心主(zhu)義(yi)的(de)(de)(de)結論(lun)。《莊子·天(tian)下》還(huan)記(ji)載(zai)了(le)辯(bian)者"二十一(yi)(yi)事",其中一(yi)(yi)些命(ming)題(ti)(ti)與(yu)公(gong)孫(sun)龍有關。如"雞(ji)三足",又見(jian)于《公(gong)孫(sun)龍子·通變論(lun)》:"飛鳥(niao)(niao)之景,未嘗(chang)動(dong)也。"也是屬于公(gong)孫(sun)龍一(yi)(yi)派(pai)的(de)(de)(de)命(ming)題(ti)(ti)。景即(ji)影(ying)。這(zhe)(zhe)個(ge)命(ming)題(ti)(ti)是說,飛鳥(niao)(niao)的(de)(de)(de)影(ying)子并沒有在運(yun)動(dong)。在每一(yi)(yi)瞬(shun)間(jian),飛鳥(niao)(niao)的(de)(de)(de)影(ying)子可以認(ren)為是不動(dong)的(de)(de)(de)。
但是時間(jian)有連續性(xing),空(kong)間(jian)有延展性(xing);飛鳥之(zhi)影在時空(kong)體內又是運動著的。這個(ge)命(ming)題對(dui)運動的性(xing)質具有片面的認識,但是最終是走上(shang)形而上(shang)學,否認運動的可能性(xing)。
名家(jia)是(shi)春秋戰(zhan)國社會大變(bian)革的(de)(de)(de)(de)(de)(de)(de)產(chan)物。他(ta)們的(de)(de)(de)(de)(de)(de)(de)辯論,"不(bu)法先王,不(bu)是(shi)禮義",①具有(you)反(fan)傳(chuan)統的(de)(de)(de)(de)(de)(de)(de)精神,是(shi)為新的(de)(de)(de)(de)(de)(de)(de)政權服務(wu)的(de)(de)(de)(de)(de)(de)(de)。但由(you)于他(ta)們認識的(de)(de)(de)(de)(de)(de)(de)角(jiao)度(du)不(bu)同,因此觀點有(you)所(suo)不(bu)同。惠施(shi)、公(gong)孫龍都(dou)是(shi)片面(mian)夸大了(le)認識的(de)(de)(de)(de)(de)(de)(de)某一(yi)方面(mian),惠施(shi)強(qiang)(qiang)調事物的(de)(de)(de)(de)(de)(de)(de)"同一(yi)"(即同)的(de)(de)(de)(de)(de)(de)(de)一(yi)方面(mian),公(gong)孫龍則(ze)強(qiang)(qiang)調事物的(de)(de)(de)(de)(de)(de)(de)差(cha)別(即"異")的(de)(de)(de)(de)(de)(de)(de)一(yi)方面(mian)。他(ta)們在(zai)各自所(suo)強(qiang)(qiang)調的(de)(de)(de)(de)(de)(de)(de)方面(mian)都(dou)有(you)精辟的(de)(de)(de)(de)(de)(de)(de)思(si)想,但是(shi)這些認識卻(que)受到形而上學思(si)想方法的(de)(de)(de)(de)(de)(de)(de)限制(zhi)。他(ta)們的(de)(de)(de)(de)(de)(de)(de)錯誤是(shi)人類認識發展史上不(bu)可避免的(de)(de)(de)(de)(de)(de)(de),后期墨家(jia)的(de)(de)(de)(de)(de)(de)(de)邏輯思(si)想正是(shi)對(dui)他(ta)們的(de)(de)(de)(de)(de)(de)(de)批判(pan)總(zong)結(jie)。
但是(shi)(shi)(shi),名(ming)家在(zai)歷(li)史(shi)上(shang)是(shi)(shi)(shi)有貢獻的(de)(de),他們非常有似于古希臘的(de)(de)智(zhi)者(zhe)派,甚至(zhi)于連某些命(ming)題(ti)(ti)都是(shi)(shi)(shi)相(xiang)似的(de)(de)或者(zhe)相(xiang)同(tong)的(de)(de)(例(li)如(ru)公元前(qian)五世紀伊里亞的(de)(de)芝諾就(jiu)有過(guo)"飛(fei)矢(shi)不動(dong)"的(de)(de)命(ming)題(ti)(ti))。名(ming)辯學派和智(zhi)者(zhe)派大約前(qian)后同(tong)時(shi)各(ge)自在(zai)東方和西(xi)方以幾乎相(xiang)同(tong)的(de)(de)詭辯式的(de)(de)理論活動(dong),參(can)與(yu)了(le)當時(shi)歷(li)史(shi)性的(de)(de)社(she)會大變動(dong),并促使人類(lei)(lei)思想(xiang)認識(shi)大為深化(hua)。這是(shi)(shi)(shi)人類(lei)(lei)文(wen)明史(shi)最值得引(yin)人注目的(de)(de)現(xian)象(xiang)之一。
公孫龍(long)不像惠施那樣強(qiang)調(diao)相(xiang)對的(de)(de)(de)、變(bian)化(hua)的(de)(de)(de),而強(qiang)調(diao)“名”是(shi)絕對的(de)(de)(de)、不變(bian)的(de)(de)(de)。他由(you)此得(de)到(dao)與(yu)柏拉圖的(de)(de)(de)理念(nian)或共相(xiang)相(xiang)同的(de)(de)(de)概念(nian),柏拉圖的(de)(de)(de)理念(nian)或共相(xiang)在西方哲(zhe)學是(shi)極著名的(de)(de)(de)。
他的(de)(de)(de)著作《公孫龍子》,有一(yi)(yi)篇《白(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬論》。其主要命題(ti)是(shi)(shi)“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬非(fei)馬”。公孫龍通過三點論證(zheng),力求證(zheng)明(ming)這個命題(ti)。第一(yi)(yi)點是(shi)(shi):“馬者。所以(yi)(yi)(yi)命形也(ye);白(bai)(bai)(bai)(bai)(bai)(bai)(bai)者,所以(yi)(yi)(yi)命色也(ye)。命色者非(fei)命形也(ye)。故(gu)曰:白(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬非(fei)馬。”若用西方邏輯學術語,大家(jia)可以(yi)(yi)(yi)說,這一(yi)(yi)點是(shi)(shi)強(qiang)調,“馬”、“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)”、“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬”的(de)(de)(de)內(nei)涵的(de)(de)(de)不同(tong)。“馬”的(de)(de)(de)內(nei)涵是(shi)(shi)一(yi)(yi)種動物,“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)”的(de)(de)(de)內(nei)涵是(shi)(shi)一(yi)(yi)種顏色,“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬”的(de)(de)(de)內(nei)涵是(shi)(shi)一(yi)(yi)種動物加一(yi)(yi)種顏色。三者內(nei)涵各不相同(tong),所以(yi)(yi)(yi)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬非(fei)馬。
第二(er)點是:“求馬(ma)(ma)(ma)(ma),黃黑(hei)馬(ma)(ma)(ma)(ma)皆可(ke)致。求白馬(ma)(ma)(ma)(ma),黃黑(hei)馬(ma)(ma)(ma)(ma)不(bu)可(ke)致。……故(gu)黃黑(hei)馬(ma)(ma)(ma)(ma)一也,而可(ke)以(yi)(yi)應有馬(ma)(ma)(ma)(ma),而不(bu)可(ke)以(yi)(yi)應有白馬(ma)(ma)(ma)(ma),是白馬(ma)(ma)(ma)(ma)之非馬(ma)(ma)(ma)(ma)審矣”。“馬(ma)(ma)(ma)(ma)者(zhe),無去(qu)取于色(se)(se),故(gu)黃黑(hei)皆所(suo)以(yi)(yi)應。白馬(ma)(ma)(ma)(ma)者(zhe)有去(qu)取于色(se)(se),黃黑(hei)馬(ma)(ma)(ma)(ma)皆所(suo)以(yi)(yi)色(se)(se)去(qu),故(gu)惟(wei)白馬(ma)(ma)(ma)(ma)獨可(ke)以(yi)(yi)應耳。無去(qu)者(zhe),非有去(qu)也。故(gu)曰(yue):白馬(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)”。若用西(xi)方(fang)邏(luo)輯學術語,我(wo)們可(ke)以(yi)(yi)說(shuo),這一點是強調,“馬(ma)(ma)(ma)(ma)”、“白馬(ma)(ma)(ma)(ma)”的(de)外(wai)延的(de)不(bu)同(tong)。“馬(ma)(ma)(ma)(ma)”的(de)外(wai)延包括一切馬(ma)(ma)(ma)(ma),不(bu)管其顏色(se)(se)的(de)區別。“白馬(ma)(ma)(ma)(ma)”的(de)外(wai)延只(zhi)包括白馬(ma)(ma)(ma)(ma),有相應的(de)顏色(se)(se)區別。由于“馬(ma)(ma)(ma)(ma)”與(yu)“白馬(ma)(ma)(ma)(ma)”外(wai)延不(bu)同(tong),所(suo)以(yi)(yi)白馬(ma)(ma)(ma)(ma)非馬(ma)(ma)(ma)(ma)。
第三點是:“馬(ma)(ma)(ma)(ma)(ma)固有(you)色,故有(you)白(bai)馬(ma)(ma)(ma)(ma)(ma)。使馬(ma)(ma)(ma)(ma)(ma)無色,有(you)馬(ma)(ma)(ma)(ma)(ma)如己耳。安取白(bai)馬(ma)(ma)(ma)(ma)(ma)?故白(bai)者,非(fei)馬(ma)(ma)(ma)(ma)(ma)也(ye)(ye)(ye)。白(bai)馬(ma)(ma)(ma)(ma)(ma)者,馬(ma)(ma)(ma)(ma)(ma)與(yu)(yu)白(bai)也(ye)(ye)(ye),白(bai)與(yu)(yu)馬(ma)(ma)(ma)(ma)(ma)也(ye)(ye)(ye)。故曰:白(bai)馬(ma)(ma)(ma)(ma)(ma)非(fei)馬(ma)(ma)(ma)(ma)(ma)也(ye)(ye)(ye)。”這(zhe)(zhe)一(yi)點似乎是強調,“馬(ma)(ma)(ma)(ma)(ma)”這(zhe)(zhe)個共(gong)(gong)(gong)性(xing)與(yu)(yu)“白(bai)馬(ma)(ma)(ma)(ma)(ma)”這(zhe)(zhe)個共(gong)(gong)(gong)性(xing)的(de)不同(tong)。馬(ma)(ma)(ma)(ma)(ma)的(de)共(gong)(gong)(gong)性(xing),是一(yi)切馬(ma)(ma)(ma)(ma)(ma)的(de)本質屬(shu)性(xing)。它不包涵顏(yan)色,僅(jin)只是“馬(ma)(ma)(ma)(ma)(ma)作為馬(ma)(ma)(ma)(ma)(ma)”。這(zhe)(zhe)樣的(de)“馬(ma)(ma)(ma)(ma)(ma)”的(de)共(gong)(gong)(gong)性(xing)與(yu)(yu)“白(bai)馬(ma)(ma)(ma)(ma)(ma)”的(de)共(gong)(gong)(gong)性(xing)不同(tong)。也(ye)(ye)(ye)就是說,馬(ma)(ma)(ma)(ma)(ma)作為馬(ma)(ma)(ma)(ma)(ma)與(yu)(yu)白(bai)馬(ma)(ma)(ma)(ma)(ma)作為白(bai)馬(ma)(ma)(ma)(ma)(ma)不同(tong)。所以(yi)白(bai)馬(ma)(ma)(ma)(ma)(ma)非(fei)馬(ma)(ma)(ma)(ma)(ma)。
或(huo)“堅(jian)(jian)(jian)(jian)石(shi)(shi)”,除了馬(ma)作為馬(ma),又還有(you)(you)(you)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)作為白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai),即白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)的(de)(de)共(gong)(gong)相。《白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)論》中說:“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)者不(bu)(bu)定所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai),忘之而可也(ye)(ye)(ye)。白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)馬(ma)者言白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)。定所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)也(ye)(ye)(ye)。定所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)者,非白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)也(ye)(ye)(ye)。”定所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai),就是(shi)(shi)(shi)具體的(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)色(se),見于(yu)各種實際(ji)的(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)色(se)物體。見于(yu)各種實際(ji)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)色(se)物體的(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)色(se),是(shi)(shi)(shi)這些物體所(suo)(suo)(suo)(suo)定的(de)(de)。但是(shi)(shi)(shi)“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)”的(de)(de)共(gong)(gong)相,則不(bu)(bu)是(shi)(shi)(shi)任(ren)何實際(ji)的(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)色(se)物體所(suo)(suo)(suo)(suo)定。它(ta)是(shi)(shi)(shi)未(wei)定的(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)的(de)(de)共(gong)(gong)性。《公(gong)孫龍(long)子》另有(you)(you)(you)一(yi)(yi)篇《堅(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)論》。其(qi)主要命題是(shi)(shi)(shi)“離(li)堅(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)”。公(gong)孫龍(long)的(de)(de)證明(ming)有(you)(you)(you)兩(liang)個部分。第(di)一(yi)(yi)部分是(shi)(shi)(shi),假(jia)設(she)有(you)(you)(you)堅(jian)(jian)(jian)(jian)而白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)的(de)(de)石(shi)(shi),他設(she)問說:“堅(jian)(jian)(jian)(jian)、白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)、石(shi)(shi):三,可乎?曰(yue):不(bu)(bu)可。曰(yue):二(er)(er),可乎?曰(yue):可。曰(yue):何哉?曰(yue):無(wu)堅(jian)(jian)(jian)(jian)得(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai),其(qi)舉(ju)也(ye)(ye)(ye)二(er)(er);無(wu)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)得(de)(de)堅(jian)(jian)(jian)(jian),其(qi)舉(ju)也(ye)(ye)(ye)二(er)(er)”。“視不(bu)(bu)得(de)(de)其(qi)所(suo)(suo)(suo)(suo)堅(jian)(jian)(jian)(jian)而得(de)(de)其(qi)所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)者,無(wu)堅(jian)(jian)(jian)(jian)也(ye)(ye)(ye)。拊不(bu)(bu)得(de)(de)其(qi)所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)而得(de)(de)其(qi)所(suo)(suo)(suo)(suo)堅(jian)(jian)(jian)(jian),得(de)(de)其(qi)堅(jian)(jian)(jian)(jian)也(ye)(ye)(ye),無(wu)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)也(ye)(ye)(ye)。”這段(duan)對話(hua)是(shi)(shi)(shi)從知識論方(fang)面證明(ming)堅(jian)(jian)(jian)(jian)、白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)是(shi)(shi)(shi)彼此分離(li)的(de)(de)。有(you)(you)(you)一(yi)(yi)堅(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)石(shi)(shi),用眼看,則只(zhi)“得(de)(de)其(qi)所(suo)(suo)(suo)(suo)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)”,只(zhi)得(de)(de)一(yi)(yi)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)石(shi)(shi);用手摸(mo),則只(zhi)“得(de)(de)其(qi)所(suo)(suo)(suo)(suo)堅(jian)(jian)(jian)(jian)”,只(zhi)得(de)(de)一(yi)(yi)堅(jian)(jian)(jian)(jian)石(shi)(shi)。感(gan)(gan)覺白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)時不(bu)(bu)能感(gan)(gan)覺堅(jian)(jian)(jian)(jian),感(gan)(gan)覺堅(jian)(jian)(jian)(jian)時不(bu)(bu)能感(gan)(gan)覺白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)。所(suo)(suo)(suo)(suo)以,從知識論方(fang)面說,只(zhi)有(you)(you)(you)“白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)石(shi)(shi)”沒有(you)(you)(you)“堅(jian)(jian)(jian)(jian)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)石(shi)(shi)”。這就是(shi)(shi)(shi)“無(wu)堅(jian)(jian)(jian)(jian)得(de)(de)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai),其(qi)舉(ju)也(ye)(ye)(ye)二(er)(er);無(wu)白(bai)(bai)(bai)(bai)(bai)(bai)(bai)(bai)得(de)(de)堅(jian)(jian)(jian)(jian),其(qi)舉(ju)也(ye)(ye)(ye)二(er)(er)”的(de)(de)意思。
他的(de)(de)(de)(de)(de)(de)(de)關(guan)(guan)于(yu)名與(yu)實的(de)(de)(de)(de)(de)(de)(de)關(guan)(guan)系的(de)(de)(de)(de)(de)(de)(de)理論是(shi)(shi)(shi)(shi)(shi)(shi)建立(li)在(zai)(zai)(zai)(zai)他的(de)(de)(de)(de)(de)(de)(de)關(guan)(guan)于(yu)共相(xiang)的(de)(de)(de)(de)(de)(de)(de)唯心(xin)(xin)主(zhu)義(yi)哲學理論之(zhi)(zhi)上(shang)的(de)(de)(de)(de)(de)(de)(de)。他認為,共相(xiang)是(shi)(shi)(shi)(shi)(shi)(shi)一(yi)(yi)(yi)(yi)種獨(du)立(li)存(cun)在(zai)(zai)(zai)(zai)。他的(de)(de)(de)(de)(de)(de)(de)“堅白論”就(jiu)(jiu)是(shi)(shi)(shi)(shi)(shi)(shi)企(qi)圖(tu)論證一(yi)(yi)(yi)(yi)塊白石頭的(de)(de)(de)(de)(de)(de)(de)白色(se)(se)和(he)堅硬(ying)(ying)(ying)性(xing)是(shi)(shi)(shi)(shi)(shi)(shi)可(ke)以(yi)(yi)獨(du)立(li)存(cun)在(zai)(zai)(zai)(zai)的(de)(de)(de)(de)(de)(de)(de)。他首(shou)先從關(guan)(guan)于(yu)“堅白石”的(de)(de)(de)(de)(de)(de)(de)感(gan)(gan)覺(jue)來進(jin)行分析,企(qi)圖(tu)說(shuo)(shuo)(shuo)(shuo)(shuo)明,“堅”與(yu)“白”可(ke)以(yi)(yi)互相(xiang)分離(li)(li)(li)(li),然(ran)后再(zai)說(shuo)(shuo)(shuo)(shuo)(shuo)明它們可(ke)以(yi)(yi)離(li)(li)(li)(li)開(kai)(kai)人們的(de)(de)(de)(de)(de)(de)(de)意(yi)(yi)識(shi)(shi)(shi)而(er)(er)存(cun)在(zai)(zai)(zai)(zai)。他說(shuo)(shuo)(shuo)(shuo)(shuo):“視(shi)不(bu)(bu)(bu)得(de)其所(suo)(suo)(suo)(suo)堅而(er)(er)得(de)其所(suo)(suo)(suo)(suo)白者,無堅也(ye)(ye)。,拊不(bu)(bu)(bu)得(de)其所(suo)(suo)(suo)(suo)白而(er)(er)得(de)其所(suo)(suo)(suo)(suo)堅者,無白也(ye)(ye)。”(《堅白論》)又說(shuo)(shuo)(shuo)(shuo)(shuo):“得(de)其白.得(de)其堅,見(jian)(jian)(jian)(jian)與(yu)不(bu)(bu)(bu)見(jian)(jian)(jian)(jian)離(li)(li)(li)(li):不(bu)(bu)(bu)見(jian)(jian)(jian)(jian)離(li)(li)(li)(li)。一(yi)(yi)(yi)(yi)一(yi)(yi)(yi)(yi)不(bu)(bu)(bu)相(xiang)盈故離(li)(li)(li)(li),離(li)(li)(li)(li)也(ye)(ye)者藏(zang)(zang)也(ye)(ye)。”(同上(shang))這(zhe)(zhe)是(shi)(shi)(shi)(shi)(shi)(shi)說(shuo)(shuo)(shuo)(shuo)(shuo),看(kan)的(de)(de)(de)(de)(de)(de)(de)時(shi)候(hou)(hou)感(gan)(gan)覺(jue)不(bu)(bu)(bu)到(dao)(dao)堅硬(ying)(ying)(ying)性(xing),而(er)(er)只感(gan)(gan)覺(jue)到(dao)(dao)白色(se)(se),這(zhe)(zhe)時(shi)候(hou)(hou)堅硬(ying)(ying)(ying)性(xing)等(deng)于(yu)沒(mei)有(you)。觸的(de)(de)(de)(de)(de)(de)(de)時(shi)候(hou)(hou)感(gan)(gan)覺(jue)不(bu)(bu)(bu)到(dao)(dao)白色(se)(se),而(er)(er)只感(gan)(gan)覺(jue)到(dao)(dao)堅硬(ying)(ying)(ying)性(xing),這(zhe)(zhe)時(shi)候(hou)(hou)白色(se)(se)等(deng)于(yu)沒(mei)有(you)。或者感(gan)(gan)覺(jue)到(dao)(dao)白色(se)(se),或者感(gan)(gan)覺(jue)到(dao)(dao)堅硬(ying)(ying)(ying)性(xing)。感(gan)(gan)覺(jue)到(dao)(dao)的(de)(de)(de)(de)(de)(de)(de)與(yu)感(gan)(gan)覺(jue)不(bu)(bu)(bu)到(dao)(dao)的(de)(de)(de)(de)(de)(de)(de)是(shi)(shi)(shi)(shi)(shi)(shi)彼此(ci)分離(li)(li)(li)(li)的(de)(de)(de)(de)(de)(de)(de)。彼此(ci)不(bu)(bu)(bu)聯在(zai)(zai)(zai)(zai)一(yi)(yi)(yi)(yi)起,所(suo)(suo)(suo)(suo)以(yi)(yi)說(shuo)(shuo)(shuo)(shuo)(shuo)是(shi)(shi)(shi)(shi)(shi)(shi)分離(li)(li)(li)(li)。而(er)(er)分離(li)(li)(li)(li)就(jiu)(jiu)是(shi)(shi)(shi)(shi)(shi)(shi)藏(zang)(zang)在(zai)(zai)(zai)(zai)自(zi)身(shen)(shen)之(zhi)(zhi)中。(公(gong)孫(sun)龍自(zi)己解釋(shi)說(shuo)(shuo)(shuo)(shuo)(shuo)“藏(zang)(zang)”是(shi)(shi)(shi)(shi)(shi)(shi)指“自(zi)藏(zang)(zang)”有(you)相(xiang)當于(yu)“潛存(cun)”之(zhi)(zhi)意(yi)(yi))公(gong)孫(sun)龍的(de)(de)(de)(de)(de)(de)(de)這(zhe)(zhe)兩(liang)段(duan)話(hua)是(shi)(shi)(shi)(shi)(shi)(shi)說(shuo)(shuo)(shuo)(shuo)(shuo)堅白石的(de)(de)(de)(de)(de)(de)(de)白色(se)(se)和(he)堅硬(ying)(ying)(ying)性(xing)是(shi)(shi)(shi)(shi)(shi)(shi)可(ke)以(yi)(yi)彼此(ci)分離(li)(li)(li)(li)而(er)(er)存(cun)在(zai)(zai)(zai)(zai)的(de)(de)(de)(de)(de)(de)(de)。他又說(shuo)(shuo)(shuo)(shuo)(shuo):“且猶(you)白,以(yi)(yi)目,以(yi)(yi)火見(jian)(jian)(jian)(jian),而(er)(er)火不(bu)(bu)(bu)見(jian)(jian)(jian)(jian);則火與(yu)目不(bu)(bu)(bu)見(jian)(jian)(jian)(jian)而(er)(er)神(shen)(shen)(shen)見(jian)(jian)(jian)(jian)。神(shen)(shen)(shen)不(bu)(bu)(bu)見(jian)(jian)(jian)(jian),而(er)(er)見(jian)(jian)(jian)(jian)離(li)(li)(li)(li)。”(同上(shang))這(zhe)(zhe)里(li)所(suo)(suo)(suo)(suo)說(shuo)(shuo)(shuo)(shuo)(shuo)的(de)(de)(de)(de)(de)(de)(de)“神(shen)(shen)(shen)”即精神(shen)(shen)(shen)作用(yong),也(ye)(ye)就(jiu)(jiu)是(shi)(shi)(shi)(shi)(shi)(shi)指意(yi)(yi)識(shi)(shi)(shi);“火”就(jiu)(jiu)是(shi)(shi)(shi)(shi)(shi)(shi)光。這(zhe)(zhe)是(shi)(shi)(shi)(shi)(shi)(shi)說(shuo)(shuo)(shuo)(shuo)(shuo),例(li)如白色(se)(se)是(shi)(shi)(shi)(shi)(shi)(shi)靠著眼(yan)睛(jing)(jing)和(he)光看(kan)見(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)。但(dan)光本身(shen)(shen)沒(mei)有(you)見(jian)(jian)(jian)(jian)物的(de)(de)(de)(de)(de)(de)(de)作用(yong),那(nei)么光和(he)眼(yan)睛(jing)(jing)合在(zai)(zai)(zai)(zai)一(yi)(yi)(yi)(yi)起也(ye)(ye)不(bu)(bu)(bu)能看(kan)見(jian)(jian)(jian)(jian),只能是(shi)(shi)(shi)(shi)(shi)(shi)意(yi)(yi)識(shi)(shi)(shi)在(zai)(zai)(zai)(zai)看(kan)見(jian)(jian)(jian)(jian),而(er)(er)意(yi)(yi)識(shi)(shi)(shi)本身(shen)(shen)也(ye)(ye)是(shi)(shi)(shi)(shi)(shi)(shi)沒(mei)有(you)見(jian)(jian)(jian)(jian)物作用(yong)的(de)(de)(de)(de)(de)(de)(de)。所(suo)(suo)(suo)(suo)以(yi)(yi)白色(se)(se)是(shi)(shi)(shi)(shi)(shi)(shi)和(he)視(shi)覺(jue)分離(li)(li)(li)(li)著的(de)(de)(de)(de)(de)(de)(de)。公(gong)孫(sun)龍在(zai)(zai)(zai)(zai)這(zhe)(zhe)里(li)是(shi)(shi)(shi)(shi)(shi)(shi)在(zai)(zai)(zai)(zai)說(shuo)(shuo)(shuo)(shuo)(shuo)明白色(se)(se)等(deng)共相(xiang)是(shi)(shi)(shi)(shi)(shi)(shi)可(ke)以(yi)(yi)離(li)(li)(li)(li)開(kai)(kai)人類(lei)的(de)(de)(de)(de)(de)(de)(de)感(gan)(gan)覺(jue)而(er)(er)獨(du)立(li)存(cun)在(zai)(zai)(zai)(zai)的(de)(de)(de)(de)(de)(de)(de)。(公(gong)孫(sun)龍在(zai)(zai)(zai)(zai)這(zhe)(zhe)里(li)犯了(le)一(yi)(yi)(yi)(yi)些邏輯錯誤(wu)。因為由(you)眼(yan)睛(jing)(jing)離(li)(li)(li)(li)開(kai)(kai)了(le)光不(bu)(bu)(bu)能見(jian)(jian)(jian)(jian)物和(he)光本身(shen)(shen)沒(mei)有(you)見(jian)(jian)(jian)(jian)物作用(yong)這(zhe)(zhe)樣的(de)(de)(de)(de)(de)(de)(de)前提,不(bu)(bu)(bu)能推(tui)出(chu),眼(yan)睛(jing)(jing)和(he)光合在(zai)(zai)(zai)(zai)一(yi)(yi)(yi)(yi)起也(ye)(ye)不(bu)(bu)(bu)能看(kan)見(jian)(jian)(jian)(jian)。)由(you)這(zhe)(zhe)一(yi)(yi)(yi)(yi)些話(hua)可(ke)以(yi)(yi)清楚地看(kan)出(chu)來,公(gong)孫(sun)龍主(zhu)張像“白色(se)(se)”這(zhe)(zhe)一(yi)(yi)(yi)(yi)類(lei)共相(xiang)是(shi)(shi)(shi)(shi)(shi)(shi)客觀存(cun)在(zai)(zai)(zai)(zai)的(de)(de)(de)(de)(de)(de)(de),因之(zhi)(zhi)他是(shi)(shi)(shi)(shi)(shi)(shi)客觀唯心(xin)(xin)主(zhu)義(yi)者。
公(gong)孫龍(long)觀(guan)察事物,雖然把個別(bie)與(yu)一般(ban)用"離"的(de)(de)觀(guan)點絕對化(hua),只見離而(er)不(bu)(bu)見合,不(bu)(bu)符合辯證(zheng)法的(de)(de)“個別(bie)存在于(yu)一般(ban)之(zhi)中(zhong)”的(de)(de)觀(guan)點,但(dan)他能夠開(kai)辟(pi)邏(luo)輯(ji)領域(yu),建(jian)立邏(luo)輯(ji)學的(de)(de)理論體(ti)系,有助于(yu)百(bai)家爭鳴的(de)(de)發展。中(zhong)國歷史上多(duo)數學派看重研究政治(zhi)倫理,多(duo)不(bu)(bu)懂邏(luo)輯(ji)學,甚至(zhi)不(bu)(bu)承(cheng)認這門學問(wen),往往以政治(zhi)倫理觀(guan)念來批評公(gong)孫龍(long)的(de)(de)邏(luo)輯(ji)思想,直到近世人們才公(gong)開(kai)承(cheng)認公(gong)孫龍(long)辯學對象(xiang)邏(luo)輯(ji)的(de)(de)問(wen)題,并加以重視。
公孫(sun)龍“白馬非(fei)馬”的(de)(de)(de)論說雖然有其一(yi)(yi)定(ding)的(de)(de)(de)合理(li)性(xing)(xing)和(he)開創性(xing)(xing),也(ye)符合辯(bian)證法講的(de)(de)(de)個別(bie)與一(yi)(yi)般相區(qu)別(bie)的(de)(de)(de)原理(li),更有糾(jiu)正當時名實混亂的(de)(de)(de)作用。但是,他沿著同樣(yang)的(de)(de)(de)原理(li)隨后再提(ti)出的(de)(de)(de)“雞三足”、“火不(bu)熱”等辯(bian)說確有走(zou)火入魔之嫌,已墜入“詭辯(bian)”的(de)(de)(de)深淵中。怪不(bu)得荀子要斥他為(wei)“此(ci)惑于(yu)用名以(yi)亂實也(ye)。”鄒衍(yan)要批評他是“害大道”、“不(bu)能無害君子”。
諸子各家(jia)普遍認為公孫龍為詭辯(bian),又似乎無法在辯(bian)論(lun)中勝出。
《公孫龍子》第一章《跡(ji)府》記載(zai)了孔子的后代(dai)孔穿企圖(tu)駁倒公孫龍但(dan)失敗的故事。
《莊子天(tian)下篇》稱公(gong)孫龍(long)“飾人(ren)之心(xin),易人(ren)之意,能(neng)勝人(ren)之口,不能(neng)服人(ren)之心(xin)”。
《荀子 不(bu)(bu)茍(gou)篇》中認為君(jun)(jun)子不(bu)(bu)看重惠施等名家(jia)的(de)(de)辯才,因為其不(bu)(bu)符合禮。君(jun)(jun)子并不(bu)(bu)是(shi)無(wu)法反(fan)駁堅白(bai)離(li)的(de)(de)觀點,而(er)是(shi)不(bu)(bu)與之(zhi)辯論。
《荀子(zi) 正(zheng)名(ming)篇》認為白馬非馬論(lun)是“此惑于用名(ming)以亂(luan)實(shi)者(zhe)也(ye)”。
《資(zi)治通鑒》中記載鄒衍認為公孫(sun)龍(long)是(shi)“煩文以相(xiang)假(jia),飾辭以相(xiang)敦,巧譬(pi)以相(xiang)移(yi),引人使不(bu)得(de)及其意(yi),如此害大道”,于是(shi)不(bu)和公孫(sun)龍(long)辯論。
周昌忠《公(gong)孫龍(long)子新論》把公(gong)孫龍(long)的(de)(de)思想和(he)西方哲學(xue)(xue)相(xiang)比較,認為公(gong)孫龍(long)“構造了一個相(xiang)當豐富的(de)(de)關于語言本身(shen)的(de)(de)哲學(xue)(xue)理(li)論”,并不比亞(ya)里士多德遜色。
張遠山在著作《寓(yu)言的(de)(de)密碼(ma)》中(zhong)認為(wei),公孫龍開創了中(zhong)國的(de)(de)理(li)性學派的(de)(de)先河(he)。但諸(zhu)子百家都未能理(li)解他(ta)的(de)(de)觀點。